Vivo Z1X PD1921F Flash File Firmware Stock Rom | Fix Touch Issue, Bootloop, and Black Screen Errors

Is your Vivo PD1921F stuck in fastboot mode, or facing black screen after system update? Download and flash the official Vivo PD1921F stock ROM to repair software faults like dead boot, OS corruption, and dm-verity verification errors using QFIL tool. All files are tested and clean.

Common Software Problems Fixed by This Flash File

• Vivo PD1921F stuck on logo or bootloop after update
• Touchscreen not working after custom ROM installation
• Black screen after flashing wrong firmware
• Stuck in fastboot or recovery mode
• dm-verity verification failed or device encryption error

Important: Always verify your device’s build number before flashing to avoid touch, camera, or IMEI issues. Flashing deletes all data.

Download Vivo PD1921F Firmware & Required Tools

Download Firmware (PD1921F_EX_A_8.70.36)

QPST Flash Tool

Qualcomm USB Drivers

Steps to Flash Stock ROM on Vivo PD1921F using QFIL

1. Extract the downloaded firmware using WinRAR or 7-Zip.
2. Install QFIL and Qualcomm USB drivers on your Windows PC.
3. Run QFIL tool and choose Flat Build from the menu.
4. Click Browse and select the prog_emmc_firehose_*.mbn file.
5. Click Load XML and select rawprogram.xml first, then patch.xml.
6. Power off the phone and boot into EDL mode (use test point if needed).
7. Connect the phone to PC. It should appear as Qualcomm HS-USB QDLoader in Device Manager.
8. Click the Download button in QFIL to start flashing.

Flashing may take a few minutes. Do not disconnect the phone during the process. Once completed, it will automatically reboot.

Frequently Asked Questions (FAQ)

Q1: My Vivo PD1921F turns on but shows a black screen, what should I do?

This issue often occurs due to incompatible firmware. Make sure to use the exact PD1921F build version firmware listed above.

Q2: The device is not detected in QFIL. How to fix it?

Ensure that Qualcomm drivers are properly installed and the phone is in EDL mode. Try a different USB cable or port if needed.

Q3: After flashing, my phone reboots to recovery again and again.

This happens due to corrupted userdata or cache. Boot into recovery mode and wipe both cache and data partitions.

Q4: Will flashing this firmware remove FRP (Google account lock)?

No, flashing the stock ROM will not bypass FRP. You’ll need to log in with the previously synced Google account.